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In the early twenty-seventh century, Pluto launched an interstellar war. The retaliating tyrant made a desperate attempt to blow up the sun. However, due to a mistake, the planet's orbit shifted. At the same time, the sun affected the earth's ground environment, resulting in increasingly severe and extreme weather. As a last resort, people spent several years building underground cities and moving to underground cities. One billion people on earth were able to survive and reproduce. In the early days of its construction, the underground city experienced various difficulties, including zombie epidemics, volcanoes and earthquakes and other natural difficulties, as well as a series of man-made reasons such as riots and coups. However, with the efforts of the people on earth to face and overcome them, the safety of the underground city was guaranteed. At the same time, the moon, which had left the earth's orbit, established diplomatic relations with the earth, and a large number of moon people settled on the earth. With the efforts and help of all parties, the earth gradually began to return to a healthy state. But the price of all this?